分布式事务-seata

分布式事务问题

分布式前：单机单库是没有问题的

分布式后：单体应用被拆分成微服务应用，原来的三个模块被拆分成三个独立的应用，分别使用三个独立的数据源，业务操作需要调用三个服务来完成。

此时每个服务内部的数据一致性由本地事务来保证，但是全局的数据一致性问题没法保证。

用户购买商品的业务逻辑。整个业务逻辑由3个微服务提供支持:

仓储服务:对给定的商品扣除仓储数量。

订单服务:根据采购需求创建订单。

帐户服务:从用户帐户中扣除余额。

Seata简介

是什么

官网：http://seata.io/zh-cn/

Seata 是一款开源的分布式事务解决方案，致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式，为用户打造一站式的分布式解决方案。

能干嘛

一个典型的分布式事务过程

分布式事条处理过程的一个ID＋三组件模型
- Transaction lD XID------全局唯一的事务ID
- 3组件概念
  - Transaction Coordinator (TC)------事务协调者，维护全局和分支事务的状态，驱动全局事务提交或回滚。
  - Transaction Manager (TM)------事务管理器，控制全局事务的边界，负责开启一个全局事务，并最终发起全局提交或全局回滚的决议。
  - Resource Manager (RM)------资源管理器，负责分支注册、状态汇报，并接收事务协调器的指令，驱动分支(本地）事务的提交和回滚。
处理过程

1.TM向TC申请开启一个全局事务，全局事务创建成功并生成一个全局唯一的XID;

2.XID在微服务调用链路的上下文中传播;

3.RM向TC注册分支事务，将其纳入XID 对应全局事务的管辖;

4.TM向TC发起针对XID的全局提交或回滚决议;

5.TC调度XID下管辖的全部分支事务完成提交或回滚请求。

下载

https://github.com/seata/seata/releases

怎么玩

本地@Transactional
全局@GlobalTransactional

SEATA的分布式交易解决方案

我们只需要使用一个@GlobalTransactional注解在业务方法上:

Seata-Server安装

下载版本：seata-server-1.4.0.zip

seata-server-1.4.0

registry.conf修改

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "192.168.40.16:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "nacos"

  nacos {
    serverAddr = "192.168.40.16:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
  }
}

file.conf修改：

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  mode = "db"
  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.cj.jdbc.Driver"
    url = "jdbc:mysql://192.168.40.148:3306/seata?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true"
    user = "root"
    password = "Huawei@123"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }
}

创建数据库

	创建数据库seata,并建立下面三张表（branch_table, global_table, lock_table），创建undo_log表放到业务库中
-- the table to store GlobalSession data
drop table if exists `global_table`;
create table `global_table` (
 `xid` varchar(128) not null,
 `transaction_id` bigint,
 `status` tinyint not null,
 `application_id` varchar(32),
 `transaction_service_group` varchar(32),
 `transaction_name` varchar(128),
 `timeout` int,
 `begin_time` bigint,
 `application_data` varchar(2000),
 `gmt_create` datetime,
 `gmt_modified` datetime,
 primary key (`xid`),
 key `idx_gmt_modified_status` (`gmt_modified`, `status`),
 key `idx_transaction_id` (`transaction_id`)
);
 
-- the table to store BranchSession data
drop table if exists `branch_table`;
create table `branch_table` (
 `branch_id` bigint not null,
 `xid` varchar(128) not null,
 `transaction_id` bigint ,
 `resource_group_id` varchar(32),
 `resource_id` varchar(256) ,
 `lock_key` varchar(128) ,
 `branch_type` varchar(8) ,
 `status` tinyint,
 `client_id` varchar(64),
 `application_data` varchar(2000),
 `gmt_create` datetime,
 `gmt_modified` datetime,
 primary key (`branch_id`),
 key `idx_xid` (`xid`)
);
 
-- the table to store lock data
drop table if exists `lock_table`;
create table `lock_table` (
 `row_key` varchar(128) not null,
 `xid` varchar(96),
 `transaction_id` long ,
 `branch_id` long,
 `resource_id` varchar(256) ,
 `table_name` varchar(32) ,
 `pk` varchar(36) ,
 `gmt_create` datetime ,
 `gmt_modified` datetime,
 primary key(`row_key`)
);
 
-- the table to store seata xid data
-- 0.7.0+ add context
-- you must to init this sql for you business databese. the seata server not need it.
-- 此脚本必须初始化在你当前的业务数据库中，用于AT 模式XID记录。与server端无关（注：业务数据库）
-- 注意此处0.3.0+ 增加唯一索引 ux_undo_log
drop table `undo_log`;
CREATE TABLE `undo_log` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `branch_id` bigint(20) NOT NULL,
 `xid` varchar(100) NOT NULL,
 `context` varchar(128) NOT NULL,
 `rollback_info` longblob NOT NULL,
 `log_status` int(11) NOT NULL,
 `log_created` datetime NOT NULL,
 `log_modified` datetime NOT NULL,
 `ext` varchar(100) DEFAULT NULL,
 PRIMARY KEY (`id`),
 UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

启动

seata-1.4\bin目录下：双击 seata-server.bat
nacos中查看服务是否注册成功

seata-1.4.0

解压安装包，并修改配置

修改config.txt

路径：script\config-center
修改service.vgroupMapping和数据库地址
service.vgroupMapping.system-server-group=default
service.vgroupMapping.product-server-group=default
store.mode=db
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.cj.jdbc.Driver
store.db.url=jdbc:mysql://192.168.40.148:3306/seata?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
store.db.user=root
store.db.password=Huawei@123
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000

注：
service.vgroupMapping.system-server-group=default
service.vgroupMapping.product-server-group=default

system-server-group、product-server-group 与项目模块中yml配置的seata.tx-service-group内容相同

启动nacos-config.sh

将配置注入到nacos中

在seata-server-1.4.0\script\config-center\nacos目录下，右键 Git Bash Here

输入命令：

sh nacos-config.sh -h 192.168.40.16 -p 8848 -g SEATA_GROUP -u nacos -w nacos

返回成功

nacos中查看配置

订单/库存/账户业务数据库准备

以下演示都需要先启动Nacos后启动Seata，保证两个都OK

分布式事务业务说明

业务说明

这里我们会创建三个服务，一个订单服务，一个库存服务，一个账户服务。

当用户下单时，会在订单服务中创建一个订单，然后通过远程调用库存服务来扣减下单商品的库存，再通过远程调用账户服务来扣减用户账户里面的余额，
最后在订单服务中修改订单状态为已完成。

该操作跨越三个数据库，有两次远程调用，很明显会有分布式事务问题。

下订单--->扣库存--->减账户(余额)

创建业务数据库

seata_order:存储订单的数据库;

seata_storage:存储库存的数据库;

seata_account:存储账户信息的数据库。

建库SQL

CREATE DATABASE seata_order;
CREATE DATABASE seata_storage;
CREATE DATABASE seata_account;

按照上述3库分别建对应业务表

seata_order库下建t_order表

CREATE TABLE t_order (
	id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
	user_id BIGINT(11) DEFAULT NULL COMMENT '用户id',
	product_id BIGINT(11) DEFAULT NULL COMMENT '产品id',
	count INT(11) DEFAULT NULL COMMENT '数量',
	money DECIMAL(11,0) DEFAULT NULL COMMENT '金额',
	status INT(1) DEFAULT NULL COMMENT '订单状态: 0: 创建中; 1∶ 已完结'
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

SELECT * FROM t_order;

seata_storage库下建t_storage表

use seata_storage;
CREATE TABLE t_storage (
	id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
	product_id BIGINT(11) DEFAULT NULL COMMENT '产品id',
	total INT(11) DEFAULT NULL COMMENT '总库存',
	used INT(11) DEFAULT NULL COMMENT '已用库存',
	residue INT(11) DEFAULT NULL COMMENT '剩余库存'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

INSERT INTO seata_storage.t_storage(id, product_id, total, used, residue) VALUES('1', '1', '100', '0', '100');

SELECT * FROM t_storage;

seata_account库下建t_account表

use seata_account;
CREATE TABLE t_account (
	id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',
	user_id BIGINT(11) DEFAULT NULL COMMENT '用户id',
	total DECIMAL(10,0) DEFAULT NULL COMMENT '总额度', 
	used DECIMAL(10,0) DEFAULT NULL COMMENT '已用余额', 
	residue DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用额度'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

INSERT INTO seata_account.t_account(id, user_id, total, used, residue) VALUES('1', '1', '1000', '0', '1000');
SELECT * FROM t_account;

按照上述3库分别建对应的回滚日志表

订单-库存-账户3个库下都需要建各自的回滚日志表

-- the table to store seata xid data
-- 0.7.0+ add context
-- you must to init this sql for you business databese. the seata server not need it.
-- 此脚本必须初始化在你当前的业务数据库中，用于AT 模式XID记录。与server端无关（注：业务数据库）
-- 注意此处0.3.0+ 增加唯一索引 ux_undo_log
drop table `undo_log`;
CREATE TABLE `undo_log` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

最终效果

订单/库存/账户业务微服务准备

业务需求

下订单->减库存->扣余额->改(订单)状态

新建订单Order-Module

1.seata-order-service2001

2.POM

<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactid>springcloud</artifactid>
        <groupid>com.zy</groupid>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelversion>4.0.0</modelversion>

    <artifactid>seata-order-service2001</artifactid>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-seata</artifactid>
            <exclusions><!--排除-->
                <exclusion>
                    <groupid>io.seata</groupid>
                    <artifactid>seata-spring-boot-starter</artifactid>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupid>io.seata</groupid>
            <artifactid>seata-spring-boot-starter</artifactid>
            <version>1.4.0</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-actuator</artifactid>
        </dependency>
        <dependency>
            <groupid>org.mybatis.spring.boot</groupid>
            <artifactid>mybatis-spring-boot-starter</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>druid-spring-boot-starter</artifactid>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-jdbc</artifactid>
        </dependency>
        <!--  自动热部署   -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-devtools</artifactid>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

3.YML

server:
  port: 2001
seata:
  enabled: true
  tx-service-group: my_test_tx_group
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
      cluster: default
      group: SEATA_GROUP
  config:
    nacos:
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
  service:
    vgroup-mapping:
      my_test_tx_group: default
    disable-global-transaction: false
  client:
    rm:
      report-success-enable: false
spring:
  application:
    name: seata-order-service
  cloud:
    alibaba:
      seata:
        enabled: true
        # 自定义事务组名称雷要与config.txt中的service.vgroupMapping.my_test_tx_group=default对应
        tx-service-group: my_test_tx_group
    nacos:
      discovery:
        server-addr: 192.168.40.16:8848 #配置nacos地址
        username: nacos
        password: nacos
        group: SEATA_GROUP
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.40.148:3306/seata_order?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useSSL=false
    username: root
    password: Huawei@123
feign:
  hystrix:
    enabled: false
logging:
  level:
    io:
      seata: info
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.zy.springcloud.domain

4.domain

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<t> {
    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code, String message) {
        this(code, message, null);
    }
}

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order {
    private Long id;
    private Long userId;
    private Long productId;
    private Integer count;
    private BigDecimal money;
    private Integer status; // 订单状态：0：创建中；1：已完结
}

5.Dao接口及实现

package com.zy.springcloud.dao;

import com.zy.springcloud.domain.Order;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface OrderDao {
    // 新建订单
    void create(Order order);

    // 修改订单状态，从0修改为1
    void update(@Param("userId") Long userId, @Param("status") Integer status);
}

6.Service接口及实现

package com.zy.springcloud.service;

import com.zy.springcloud.domain.Order;

public interface OrderService {
    public void create(Order order);
}

package com.zy.springcloud.service.impl;

import com.zy.springcloud.dao.OrderDao;
import com.zy.springcloud.domain.Order;
import com.zy.springcloud.service.AccountService;
import com.zy.springcloud.service.OrderService;
import com.zy.springcloud.service.StorageService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Resource
    private OrderDao orderDao;
    @Resource
    private StorageService storageService;
    @Resource
    private AccountService accountService;

    @GlobalTransactional(name = "my_test_tx_group", rollbackFor = Exception.class)
    @Override
    public void create(Order order) {
        log.info("------>开始创建订单");
        orderDao.create(order);
        log.info("----->订单微服务开始调用库存，做扣减");
        storageService.decrease(order.getProductId( ), order.getCount());
        log.info( "----->订单微服务开始调用库存，做扣减end" );

        log.info( "----->订单微服务开始调用账户，做扣减");
        accountService.decrease(order.getUserId(), order.getMoney());
        log.info( "----->订单微服务开始调用账户，做扣减end");

        // 4修改订单状态，从零到i ,1代表已经完成log.info("----->修改订单状态开始");
        log.info( "----->修改订单状态开始");
        orderDao.update(order.getUserId(), 0);
        log.info( "----->修改订单状态结束");
    }
}

package com.zy.springcloud.service;

import com.zy.springcloud.domain.CommonResult;
import com.zy.springcloud.domain.Order;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

@FeignClient(value = "seata-account-service")
public interface AccountService {
    @PostMapping(value = "/account/decrease")
    CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}

package com.zy.springcloud.service;

import com.zy.springcloud.domain.CommonResult;
import com.zy.springcloud.domain.Order;
import org.apache.ibatis.annotations.Param;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "seata-storage-service")
public interface StorageService {
    @PostMapping(value = "/storage/decrease")
    CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
}

7.Controller

package com.zy.springcloud.controller;

import com.zy.springcloud.domain.CommonResult;
import com.zy.springcloud.domain.Order;
import com.zy.springcloud.service.OrderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class OrderController {
    @Resource
    private OrderService orderService;

    @GetMapping("/order/create")
    public CommonResult create(Order order) {
        orderService.create(order);
        return new CommonResult(200, "创建订单成功");
    }
}

8.Config配置

package com.zy.springcloud.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan({"com.zy.springcloud.dao"})
public class MyBatisConfig {
}

package com.zy.springcloud.config;

import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
public class DataSourceProxyConfig {
    @Value("${mybatis.mapper-locations}")
    private String mapperLocations;

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    @Bean
    public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSourceProxy) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }
}

9.主启动

package com.zy.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建的配置
public class SeataOrderMainApp2001 {
    public static void main(String[] args) {
        SpringApplication.run(SeataOrderMainApp2001.class, args);
    }
}

10.mapper

<!--?xml version="1.0" encoding="UTF-8" ?-->

<mapper namespace="com.zy.springcloud.dao.OrderDao">
    <insert id="create" parametertype="com.zy.springcloud.domain.Order">
        insert into t_order(id, user_id, product_id, count, money, status)
        values (null, #{userId}, #{productId}, #{count}, #{money}, 0)
    </insert>

    <resultmap id="orderResultMap" type="com.zy.springcloud.domain.Order">
        <id column="id" property="id" jdbctype="BIGINT">
        <id column="user_id" property="userId" jdbctype="BIGINT">
        <id column="product_id" property="productId" jdbctype="BIGINT">
        <id column="count" property="count" jdbctype="INTEGER">
        <id column="money" property="money" jdbctype="DECIMAL">
        <id column="status" property="status" jdbctype="INTEGER">
    </id></id></id></id></id></id></resultmap>
    <update id="update">
        update t_order set status = 1 where user_id = #{userId} and status = #{status}
    </update>
</mapper>

新建库存Storage -Module

1.模块

seata-storage-service2002

2.pom

<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactid>springcloud</artifactid>
        <groupid>com.zy</groupid>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelversion>4.0.0</modelversion>

    <artifactid>seata-storage-service2002</artifactid>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-seata</artifactid>
            <exclusions><!--排除-->
                <exclusion>
                    <groupid>io.seata</groupid>
                    <artifactid>seata-spring-boot-starter</artifactid>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupid>io.seata</groupid>
            <artifactid>seata-spring-boot-starter</artifactid>
            <version>1.4.0</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-actuator</artifactid>
        </dependency>
        <dependency>
            <groupid>org.mybatis.spring.boot</groupid>
            <artifactid>mybatis-spring-boot-starter</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>druid-spring-boot-starter</artifactid>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-jdbc</artifactid>
        </dependency>
        <!--  自动热部署   -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-devtools</artifactid>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

3.yaml

server:
  port: 2002
seata:
  enabled: true
  tx-service-group: my_test_tx_group
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
      cluster: default
      group: SEATA_GROUP
  config:
    type: nacos
    nacos:
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
  service:
    vgroup-mapping:
      my_test_tx_group: default
    disable-global-transaction: false
  client:
    rm:
      report-success-enable: false
spring:
  application:
    name: seata-storage-service
  cloud:
    alibaba:
      seata:
        enabled: true
        # 自定义事务组名称雷要与config.txt中的service.vgroupMapping.my_test_tx_group=default对应
        tx-service-group: my_test_tx_group
    nacos:
      discovery:
        server-addr: 192.168.40.16:8848 #配置nacos地址
        group: SEATA_GROUP
        username: nacos
        password: nacos
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.40.148:3306/seata_storage?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useSSL=false
    username: root
    password: Huawei@123
feign:
  hystrix:
    enabled: false
logging:
  level:
    io:
      seata: info
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.zy.springcloud.domain

4.domain

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<t> {
    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code, String message) {
        this(code, message, null);
    }
}

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Storage {

    private Long id;

    // 产品id
    private Long productId;

    //总库存
    private Integer total;

    //已用库存
    private Integer used;

    //剩余库存
    private Integer residue;
}

5.Dao接口

package com.zy.springcloud.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface StorageDao {
    void decrease(@Param("productId") Long productId, @Param("count") Integer count);
}

6.Service接口

package com.zy.springcloud.service;


import feign.Param;

public interface StorageService {
    //扣减库存信息
    void decrease(Long productId, Integer count);
}

package com.zy.springcloud.service.impl;

import com.zy.springcloud.dao.StorageDao;
import com.zy.springcloud.service.StorageService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;


@Service
public class StorageServiceImpl implements StorageService {

    private static final Logger LOGGER = LoggerFactory.getLogger(StorageServiceImpl.class);

    @Resource
    private StorageDao storageDao;

    // 扣减库存
    @Override
    public void decrease(Long productId, Integer count) {
        LOGGER.info("------->storage-service中扣减库存开始");
        storageDao.decrease(productId, count);
        LOGGER.info("------->storage-service中扣减库存结束");
    }
}

7.Controller

package com.zy.springcloud.controller;

import com.zy.springcloud.domain.CommonResult;
import com.zy.springcloud.service.StorageService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StorageController {

    @Autowired
    private StorageService storageService;

    //扣减库存
    @RequestMapping("/storage/decrease")
    public CommonResult decrease(Long productId, Integer count) {
        storageService.decrease(productId, count);
        return new CommonResult(200,"扣减库存成功！");
    }
}

8.Config

package com.zy.springcloud.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
public class DataSourceProxyConfig {
    @Value("${mybatis.mapper-locations}")
    private String mapperLocations;

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    @Bean
    public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSourceProxy) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }
}

package com.zy.springcloud.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan({"com.zy.springcloud.dao"})
public class MyBatisConfig {
}

9.主启动

package com.zy.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建的配置
public class SeataStorageMainApp2002 {
    public static void main(String[] args){
        SpringApplication.run(SeataStorageMainApp2002.class,args);
    }
}

10.mapper

<!--?xml version="1.0" encoding="UTF-8" ?-->



<mapper namespace="com.zy.springcloud.dao.StorageDao">
    <resultmap id="BaseResultMap" type="com.zy.springcloud.domain.Storage">
        <id column="id" property="id" jdbctype="BIGINT">
        <result column="product_id" property="productId" jdbctype="BIGINT">
        <result column="total" property="total" jdbctype="INTEGER">
        <result column="used" property="used" jdbctype="INTEGER">
        <result column="residue" property="residue" jdbctype="INTEGER">
    </result></result></result></result></id></resultmap>

    <update id="decrease">
        UPDATE
            t_storage
        SET
            used = used + #{count},residue = residue - #{count}
        WHERE
            product_id = #{productId}
    </update>

</mapper>

新建库存Account -Module

1.模块

seata-account-service2003

2.pom

<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactid>springcloud</artifactid>
        <groupid>com.zy</groupid>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelversion>4.0.0</modelversion>

    <artifactid>seata-account-service2003</artifactid>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-seata</artifactid>
            <exclusions><!--排除-->
                <exclusion>
                    <groupid>io.seata</groupid>
                    <artifactid>seata-spring-boot-starter</artifactid>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupid>io.seata</groupid>
            <artifactid>seata-spring-boot-starter</artifactid>
            <version>1.4.0</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-actuator</artifactid>
        </dependency>
        <dependency>
            <groupid>org.mybatis.spring.boot</groupid>
            <artifactid>mybatis-spring-boot-starter</artifactid>
        </dependency>
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>druid-spring-boot-starter</artifactid>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-jdbc</artifactid>
        </dependency>
        <!--  自动热部署   -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-devtools</artifactid>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

3.YML

server:
  port: 2003
seata:
  enabled: true
  tx-service-group: my_test_tx_group
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
      cluster: default
      group: SEATA_GROUP
  config:
    type: nacos
    nacos:
      server-addr: 192.168.40.16:8848
      username: nacos
      password: nacos
  service:
    vgroup-mapping:
      my_test_tx_group: default
    disable-global-transaction: false
  client:
    rm:
      report-success-enable: false
spring:
  application:
    name: seata-account-service
  cloud:
    alibaba:
      seata:
        enabled: true
        # 自定义事务组名称雷要与config.txt中的service.vgroupMapping.my_test_tx_group=default对应
        tx-service-group: my_test_tx_group
    nacos:
      discovery:
        server-addr: 192.168.40.16:8848 #配置nacos地址
        group: SEATA_GROUP
        username: nacos
        password: nacos
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.40.148:3306/seata_account?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useSSL=false
    username: root
    password: Huawei@123
feign:
  hystrix:
    enabled: false
logging:
  level:
    io:
      seata: info
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.zy.springcloud.domain

4.domain

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {

    private Long id;

    /**
     * 用户id
     */
    private Long userId;

    /**
     * 总额度
     */
    private BigDecimal total;

    /**
     * 已用额度
     */
    private BigDecimal used;

    /**
     * 剩余额度
     */
    private BigDecimal residue;


}

package com.zy.springcloud.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<t> {

    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code,String message){
        this(code,message,null);
    }
}

5.Dao接口及实现

package com.zy.springcloud.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import java.math.BigDecimal;

@Mapper
public interface AccountDao {

    /**
     * 扣减账户余额
     */
    void decrease(@Param("userId") Long userId, @Param("money") BigDecimal money);
}

6.Service接口及实现

package com.zy.springcloud.service;

import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import java.math.BigDecimal;


public interface AccountService {

    /**
     * 扣减账户余额
     */
    void decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}

package com.zy.springcloud.service.impl;

import com.zy.springcloud.dao.AccountDao;
import com.zy.springcloud.service.AccountService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.math.BigDecimal;
import java.util.concurrent.TimeUnit;

/**
 * 账户业务实现类
 */
@Service
public class AccountServiceImpl implements AccountService {

    private static final Logger LOGGER = LoggerFactory.getLogger(AccountServiceImpl.class);


    @Resource
    AccountDao accountDao;

    /**
     * 扣减账户余额
     */
    @Override
    public void decrease(Long userId, BigDecimal money) {

        LOGGER.info("------->account-service中扣减账户余额开始");

        //异常
        try {
            TimeUnit.SECONDS.sleep(20);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        accountDao.decrease(userId,money);
        LOGGER.info("------->account-service中扣减账户余额结束");
    }
}

7.Controller

package com.zy.springcloud.controller;

import com.zy.springcloud.domain.CommonResult;
import com.zy.springcloud.service.AccountService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.math.BigDecimal;

@RestController
public class AccountController {

    @Resource
    AccountService accountService;

    /**
     * 扣减账户余额
     */
    @RequestMapping("/account/decrease")
    public CommonResult decrease(Long userId, BigDecimal money){
        accountService.decrease(userId, money);
        return new CommonResult(200,"扣减账户余额成功！");
    }
}

8.Config

package com.zy.springcloud.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
public class DataSourceProxyConfig {
    @Value("${mybatis.mapper-locations}")
    private String mapperLocations;

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    @Bean
    public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSourceProxy) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }
}

package com.zy.springcloud.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan({"com.zy.springcloud.dao"})
public class MyBatisConfig {
}

9.主启动

package com.zy.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建的配置
public class SeataAccountMainApp2003 {
    public static void main(String[] args){
        SpringApplication.run(SeataAccountMainApp2003.class,args);
    }
}

10.mapper

<!--?xml version="1.0" encoding="UTF-8" ?-->


<mapper namespace="com.zy.springcloud.dao.AccountDao">
    <resultmap id="BaseResultMap" type="com.zy.springcloud.domain.Account">
        <id column="id" property="id" jdbctype="BIGINT">
        <result column="user_id" property="userId" jdbctype="BIGINT">
        <result column="total" property="total" jdbctype="DECIMAL">
        <result column="used" property="used" jdbctype="DECIMAL">
        <result column="residue" property="residue" jdbctype="DECIMAL">
    </result></result></result></result></id></resultmap>

    <update id="decrease">
        UPDATE t_account
        SET
            residue = residue - #{money},used = used + #{money}
        WHERE
            user_id = #{userId};
    </update>

</mapper>

Test

数据库初始情况：

正常下单

http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100

数据库情况

超时异常，没加@GlobalTransactional

AccountServiceImpl添加超时

数据库情况

状态为0，0表示没有支付成功。但是实际上，库存和钱都减少了。

OrderServiceImpl添加注解@GlobalTransactional

@GlobalTransactional(name = "my_test_tx_group", rollbackFor = Exception.class)

下单后数据库数据并没有任何改变

seata原理

执行流程

TM开启分布式事务(TM向TC注册全局事务记录);

按业务场景，编排数据库、服务等事务内资源（RM向TC汇报资源准备状态）;

TM结束分布式事务，事务一阶段结束（TM通知TC提交/回滚分布式事务);

TC汇总事务信息，决定分布式事务是提交还是回滚;

TC 通知所有RM提交/回滚资源，事务二阶段结束。

支持的模式

AT模式

TCC模式

SAGA模式

XA模式

默认是TA模式

AT模式如何做到对业务的无侵入

是什么

整体机制：

两阶段提交协议的演变:

一阶段:业务数据和回滚日志记录在同一个本地事务中提交，释放本地锁和连接资源。
二阶段:
。提交异步化，非常快速地完成。
。回滚通过一阶段的回滚日志进行反向补偿。

一阶段加载

在一阶段，Seata会拦截“业务SQL”,
1解析SQL语义，找到“业务SQL”要更新的业务数据，在业务数据被更新前，将其保存成“before image”

2执行“业务SQL”更新业务数据，在业务数据更新之后

3其保存成“after image”，最后生成行锁。

以上操作全部在一个数据库事务内完成，这样保证了一阶段操作的原子性。

二阶段提交

二阶段如是顺利提交的话，
因为“业务SQL”在一阶段已经提交至数据库，所以Seata框架只需将一阶段保存的快照数据和行锁删掉，完成数据清理即可。

二阶段回滚

二阶段回滚:
二阶段如果是回滚的话，jSeata就需要回滚一阶段已经执行的“业务SQL”，还原业务数据。
回滚方式便是用“before image”还原业务数据;但在还原前要首先要校验脏写，对比“数据库当前业务数据”和“after image”,如果两份数据完全一致就说明没有脏写，可以还原业务数据，如果不一致就说明有脏写，出现脏写就需要转人工处理。

补充：

posted @ 2021-11-28 10:21 长江大河阅读(5) 评论(0) 收藏举报

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分布式事务-seata

分布式事务问题

Seata简介

是什么

能干嘛

下载

怎么玩

Seata-Server安装

下载版本：seata-server-1.4.0.zip

seata-server-1.4.0

registry.conf修改

file.conf修改：

创建数据库

启动

seata-1.4.0

修改config.txt

system-server-group、product-server-group 与项目模块中yml配置的seata.tx-service-group内容相同

启动nacos-config.sh

nacos中查看配置

订单/库存/账户业务数据库准备

以下演示都需要先启动Nacos后启动Seata，保证两个都OK

分布式事务业务说明

业务说明

创建业务数据库

按照上述3库分别建对应业务表

按照上述3库分别建对应的回滚日志表

最终效果

订单/库存/账户业务微服务准备

业务需求

新建订单Order-Module

1.seata-order-service2001

2.POM

3.YML

4.domain

5.Dao接口及实现

6.Service接口及实现

7.Controller

8.Config配置

9.主启动

10.mapper

新建库存Storage -Module

1.模块

2.pom

3.yaml

4.domain

5.Dao接口

6.Service接口

7.Controller

8.Config

9.主启动

10.mapper

新建库存Account -Module

1.模块

2.pom

3.YML

4.domain

5.Dao接口及实现

6.Service接口及实现

7.Controller

8.Config

9.主启动

10.mapper

Test

seata原理

执行流程

支持的模式

AT模式如何做到对业务的无侵入

是什么

一阶段加载

二阶段提交

二阶段回滚

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